Surgical knife



FIG. 1 is a perspective view of a surgical knife, showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a left-side elevational view thereof, the right-side elevational view being a mirror image thereof;

FIG. 5 is a front elevational view thereof; and,

FIG. 6 is a rear elevational view thereof. 

CLAIM We claim the ornamental design for a surgical knife, as shown and described. 